Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1997-12-08
1999-09-14
Martin, David
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
359874, 359876, 359877, 248487, 248282, G05B 500
Patent
active
059528028
ABSTRACT:
A mirror motor is coupled to the mirror by a ratchet coupling. A feedback signal representing the drive current of the mirror motor is digitally sampled and analyzed by a type of Fourier transform, preferably a discrete cosine transform, to determine the low frequency components of a current pulse which arises when the mirror reaches a stop at its end of travel and the ratchet operation begins to occur. A fundamental component is due to the pulse rise. Motor current is terminated if that component exceeds a threshold for a set time. A harmonic component is due to the ratchet action and pulse fall. Motor current is terminated if the harmonic element reaches another threshold.
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Delco Electronics Corp.
Funke Jimmy L.
Martin David
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